This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 12 |
| 5 | 20 |
| 6 | 55 |
| 7 | 127 |
| 8 | 371 |
| 9 | 1037 |
| 10 | 3249 |
| 11 | 10071 |
| 12 | 32913 |
| 13 | 108112 |
| 14 | 363618 |
| 15 | 1233938 |
| 16 | 4244102 |
| 17 | 14716095 |
| 18 | 51480027 |
| 19 | 181312939 |